| Watford to Castelletto sopra Ticino | 580.54 mi (934.29 km) |
| Watford to Castelli Calepio | 626.66 mi (1,008.51 km) |
| Watford to Castelnovo ne' Monti | 704.06 mi (1,133.07 km) |
| Watford to Castelnuovo Berardenga | 796.83 mi (1,282.38 km) |
| Watford to Castelnuovo di Porto | 893.82 mi (1,438.47 km) |
| Watford to Castelnuovo di Verona | 666.18 mi (1,072.12 km) |
| Watford to Castelnuovo Rangone | 715.60 mi (1,151.65 km) |
| Watford to Castelvetrano | 1,158.78 mi (1,864.87 km) |
| Watford to Castelvetro di Modena | 718.70 mi (1,156.64 km) |
| Watford to Castenaso | 735.74 mi (1,184.06 km) |
| Watford to Castenedolo | 648.17 mi (1,043.13 km) |
| Watford to Castiglion Fiorentino | 810.46 mi (1,304.31 km) |
| Watford to Castiglione del Lago | 825.47 mi (1,328.46 km) |
| Watford to Castiglione delle Stiviere | 658.58 mi (1,059.88 km) |
| Watford to Castrolibero | 1,166.37 mi (1,877.10 km) |
